Abstract
Contrasting evidence has accumulated regarding the role of acid invertase and sucrose synthase in tomato fruit sink establishment and maintenance. In this work the relationships among the activities of sucrose synthase and acid invertase, Lycopersicon esculentum Mill cv UC-82B fruit growth, and starch accumulation were analyzed in fruit at 0 to 39 d after anthesis. Sucrose synthase, but not acid invertase, was found to be positively correlated with tomato fruit relative growth rate and with starch content in the pericarp tissue. A similar association between sucrose synthase activity and starch accumulation was also evident in the basal portion of the stem. Heat-shock treatments, which inhibited the increase in sucrose synthase activity at the beginning of the light period and had no effect on acid invertase activity, were used to examine the importance of sucrose synthase in relation to sucrose metabolism and starch synthesis. After the heat-shock treatment, concomitantly with the suppressed sucrose synthase activity relative to the controls, there was a reduction in sucrose cleavage and starch accumulation. These data substantiate the conclusion that, during the early phases of tomato fruit development, sucrose synthase rather than acid invertase is the dominant enzyme in metabolizing imported sucrose, which in turn plays a part in regulating the import of sucrose into the fruit.
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Claims 9
Claim · model-written summary
Sucrose synthase activity correlated positively with tomato fruit relative growth rate.
- Taxon
- tomato
Solanum lycopersicume0 - Organ / stage
- fruite0
- Gene
- Sucrose synthasee0
- Outcome
- tomato fruit relative growth ratee0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sucrose synthase, but not acid invertase, was found to be positively correlated with tomato fruit relative growth rate”
Claim · model-written summary
Sucrose synthase activity correlated positively with pericarp starch content.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- pericarp tissuee0
- Gene
- Sucrose synthasee0
- Outcome
- starch content in the pericarp tissuee0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sucrose synthase, but not acid invertase, was found to be positively correlated with tomato fruit relative growth rate and with starch content in the pericarp tissue”
Claim · model-written summary
Acid invertase was not correlated with fruit growth rate or pericarp starch content.
- Taxon
- tomatoSolanum lycopersicume0
- Gene
- acid invertasee0
- Outcome
- tomato fruit relative growth ratee0
- Direction
- but note0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sucrose synthase, but not acid invertase, was found to be positively correlated with tomato fruit relative growth rate and with starch content in the pericarp tissue”
Claim · model-written summary
Sucrose synthase activity was associated with starch accumulation in basal stem.
- Taxon
- TomatoSolanum lycopersicumt0
- Organ / stage
- basal portion of the steme0
- Gene
- sucrose synthasee0
- Outcome
- starch accumulatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A similar association between sucrose synthase activity and starch accumulation was also evident in the basal portion of the stem”
t0“Tomato”
Claim · model-written summary
Heat shock inhibited the light period rise in sucrose synthase activity.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- Heat-shock treatmentse0
- Gene
- sucrose synthasee0
- Outcome
- sucrose synthase activitye0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat-shock treatments, which inhibited the increase in sucrose synthase activity at the beginning of the light period”
t0“Tomato”
Claim · model-written summary
Heat shock had no effect on acid invertase activity.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- Heat-shock treatmentse1
- Gene
- acid invertasee0
- Outcome
- acid invertase activitye0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“had no effect on acid invertase activity”
e1“Heat-shock treatments”
t0“Tomato”
Claim · model-written summary
Heat shock reduced sucrose cleavage relative to controls.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- heat-shock treatmente0
- Outcome
- sucrose cleavagee0
- Direction
- reductione0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After the heat-shock treatment, concomitantly with the suppressed sucrose synthase activity relative to the controls, there was a reduction in sucrose cleavage and starch accumulation”
t0“Tomato”
Claim · model-written summary
Heat shock reduced starch accumulation relative to controls.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- heat-shock treatmente0
- Outcome
- starch accumulatione0
- Direction
- reductione0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After the heat-shock treatment, concomitantly with the suppressed sucrose synthase activity relative to the controls, there was a reduction in sucrose cleavage and starch accumulation”
t0“Tomato”
Claim · model-written summary
Sucrose synthase was concluded to dominate metabolism of imported sucrose early in tomato fruit development.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- fruite0
- Gene
- sucrose synthasee0
- Outcome
- metabolizing imported sucrosee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“during the early phases of tomato fruit development, sucrose synthase rather than acid invertase is the dominant enzyme in metabolizing imported sucrose”
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See all 7 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.